Time zones:Hawaii-Aleutian — Entire length
(NOTE: Hawaii does not observe Daylight Saving Time, meaning Hawaii-Aleutian Standard Time is UTC–10:00 year-round. This is three hours behind Pacific Daylight Time and six hours behind Eastern Daylight Time in the summer, or two hours behind Pacific Standard Time and five hours behind Eastern Standard Time in the winter.)

Counties traversed:Hawaii — Honolulu

A quick hypertext drive: I have never been to the state of Hawaii at all, much less driven any of Interstate H-3. Oscar Voss’ Hawaii Highways website has this page with better information about H-3, as well as many pictures of the highway.

Like most Interstates in Hawaii, Interstate H-3 was built primarily with military needs in mind — in this case, to serve the Marine Corps base at Kaneohe Bay. However, as the pictures on Oscar Voss’ aforementioned website show, H-3 is probably the most scenic drive anywhere on the Interstate system. Two twin-tube tunnels and several long, elevated viaducts carry H-3 through a number of mountain ranges and valleys in the east-central part of the island of Oahu. The highway ends just a few yards west of the main gate to Kaneohe Marine Corps Base.